I need to know what is the limits of a cards' mask. Working with a 7 rows/8 columns mask is ok but using a 10 rows/10 columns makes Internet Explorer through an unexpected error and forces the close of the browser.
That sounds strange - I know of no issue where the size of the mask would cause such an error, but you do need to ensure that the mask file is exactly the same size as the graphics file it is associated with.
Both files have the same size. However, the error is solved: don't know what could happened, but opening and saving the mask file with Irfanview did the trick
Anyway, thanks to let me know that there is no limitation for that